Introduced use of np.asanyarray() and np.asarray() in goes.py instead of
np.array() for ensuring input is of type float64.  Also editted docstrings
of relevant functions (goes_chianti_tem(), _get_goes_chianti_temp(),
_get_goes_chianti_em()) to highlight that any array-like that can be
converted to type float64 can be used as input.